Übersetzung für "Tungstic acid" in Deutsch

The tungstic acid is removed by adding alkaline ion exchanger.

The tungstic acid is subsequently dissolved in NH 3 solution and the solution is cooled.

Cesium hydroxide is also dissolved in water, separately from the tungstic acid.

To do so, the starting quantities of tungstic acid and potassium hydroxide were increased appropriately.

Tungstic acid (H2WO4) is used only for selected metal grades. Â

Tungstic acid (H2WO4) is used only for selected metal grades.

Scheelite concentrate is digested with HCl solution at 90-100° C. so as to form tungstic acid.

Comparative Example 1 was repeated, except that tungstic acid pressed to tablets was used as the catalyst.

Tungstic acid is suspended, for example, at 40° C. in a 3.5:1 excess of aqueous hydrogen peroxide.

That is done by suspending tungstic acid in water and dissolving it by adding a base and heating.

To this end, for example, tungstic acid is suspended in water and dissolved with addition of a base and heating.

To this end, for example, tungstic acid is suspended in water and dissolved with the addition of a base and with heating.

Research indicates that an aqueous solution of inorganic acid and alkali metal tungstate can obtain tungstic acid.

This is followed by addition of a solution of 7.9 g of tungstic acid in 120 ml of water and 5 ml of 50% strength sodium hydroxide solution which before addition was likewise brought to a pH of 5.2 with 7 ml of glacial acetic acid.

Illustratively, solutions of the following compounds can be used for the individual metals: ammonium para- of meta tungstate, tungsten halides, tungstic acid, ammonium meta vanadate, vanadyl oxalate, vanadyl halides, iron chloride, iron sulfate, iron nitrate, iron hydroxide, organic iron salts, niobium oxide hydrate, niobium oxalate, as well as ammonium molybdate and molybdenum halides.

The product is separated off, washed with dilute sodium carbonate solution and water and then oxidized in an aqueous emulsion with 23 g of 35% strength hydrogen peroxide in the manner described in Example 3 with addition of catalytic amounts of tungstic acid to give the sulphone described in that example.

The resulting suspension is diluted with 300 ml of water and a neutralized solution of 0.5 g of tungstic acid in 10 ml of water and 2.0 g of sodium acetate is added to the mixture.

In the latter case, 440 g of the thioether are emulsified in 3.8 l of water, 23 g of sodium acetate are added, the pH is brought to 5.8 with 7.6 ml of ice-water and a catalyst solution of 3.5 g of tungstic acid, which is prepared in accordance with the instructions in Example 13, is added.

The solution may be prepared either by working in a weakly acid medium at a pH >3 using ammonium-metatungstenate as the soluble tungsten compound or by preparing an ammoniacal solution of tungstic acid or its anhydride or one of its salts and prevents the precipitation of the cations of the matrix metals by sequestration either with ammonia or with the usual organic sequestrants such as EDTA.

In British Pat. No. 1,412,929, an aluminum surface is treated with hot water or steam (with the formation of a layer of boehmite), and an electrolysis is thereafter carried out, as a further treatment, in an aqueous solution of a salt of silicic acid, phosphoric acid, molybdic acid, vanadic acid, permanganic acid, stannic acid, or tungstic acid.

For impregnation with tungsten, the quantity of tungstic acid corresponding to the concentration in accordance with Table 2 is dissolved in boiling ammonia solution.